questions about DVFS in saving energy

[tomb at byrneit.net (Tomas L. Byrnes)]

-----Original Message-----
From: Kai Chen [mailto:kch670 at eecs.northwestern.edu] 
Sent: Wednesday, May 13, 2009 12:25 PM
To: nanog at merit.edu
Subject: questions about DVFS in saving energy

Hi, could anyone here have some idea of the following questions about
Dynamic Voltage/Frequency Scaling techniques used for energy efficiency,
or please give a pointer that I can trace,
1) how many servers in the market support this technique?
2) how many voltages/frequencies can the servers support?
3) What's the transition time and cost (power) between these
voltages/frequencies?

Thanks,
-Kai
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My experience with the AMD HE CPUs has been that the scaling breaks
Win2K3, and any virtualized environments.